Rotary compressor



191420 J. LE VALLEY ET AL. 239,441

ROTARY COMPRESSOR Filed March 14, 1940 I 2 Sheets-Sheet 1 2 16 165Imam-022 2 THEIR ATrORNEY 2 Sheqts-Shgei 2 W m la m .m MW m m T J. LEVALLEY ETAL nomw COMPRESSOR Filed March 14, 1940 v M m, m2.

Anelfl Patented July 14,1942 2,289,441

UNITED STATES. PATENT OFFICE attain r pany, NewYor-k, N. Y., acorporation of New Jersey ApplicatlonMai-eh 14; 194', serismo. 323,868

-1c1siin. (a.z:c-zon V The present invent on relates to' a compressorthe casing l and the shell 3 is a'cover 9' which and, more particularly,it relates to a compressor iits'into the bore of casing I ofthecompressor 1 adapted for compressing'refrigerating fluid and assemblyand is employed-in'the alignment of the like. the compressor; This coverextends inwardly and A refrigerant compressor adapted for use with 5 isprovided with a bore it through which passes small refrigeration imits-may b operated by the rotor H3. The end of the rotor I3 is threaded,either an electric motor or an internal combusas at it, to receive thenut H bearing against tion engine, and it must, under most circumthewasher I 8 which, in turn, lies o t flange stances, be relatively smalland compact, In The flange is keyed to the rotor i3 by a suitableaccordance with the practice of this invention 10 means such as the w flkey 2 Fl therefore, the compressor is enclosed in a shell 35 i secured ythe bol s 2 and s 21 0 h which is divided into an intake or suctionchamother flan e 28 formed on the end of the motor be! and an outlet ordischarge chamber. The driving shaft L Thus, e w flanges 'f 'm latterchamber not only serves as a lubricant an o a y flange oupli g althougha y fo o reservoir, but it also houses the compressor itself. coup i wll be Suitable W h hi arrange- Accordingly, it 1 a object of th presenti ment, it is obvious that, upon rotation of the vention to provide acompressor which is housed Shaft t rotor 53 w l' l b rota in thedischarge chamber of the compressor shell. In Order 170 888-1 the 1 8etwe n e bo e l Another objectis to provideacompressor which and ther0901 to prevent the pe f fluid is lubricated by lubricant undercompressor fluid so m within t e p ss sh ll 3.11 s s discharge pressure.ally indicated at 33, is provided, which comprises Still another objectto provide a compressor rotating h S881 e m t r i 0 s me ma-- wherein.the exhaust ports open into a lubricant $61181 such as fl 'p e restingin a'lecess filter. formed in the bore ii. A stationary seal element Afurther obj ct is toprovid a, compressor or sleeve 39 fits in the boreii of the cover -9 wherein a cooling tube forithe compressor lubriand ip d from the rotor l3. An annular mg is located in t Suctiqn chamber ofthe shoulder 6| provided on sleeve 35bears againstshell. the, ring 35.Adjacent the inner end of.

A still further object is to provide a. rotary sleeve is a second ring43 against-which the bushcompressor wherein the exhaust ports in thecomins 18 held y' he Spring The positecnd pressor casing are arranged inh a manner as of the spring rests against one end of the needletoobviatethe noise of escaping fluid, 7 la. The function of thespring isto An additional object is to provide a motor constantly r e therotating sealelement-as a drivencompressor wherein the lubricantsupplied against the stationary e l men thus to the compressorisdischarged therefrom electing the sealing between rotor l3 and cover 9.through the exhau t ports, Extending from the inner surface of the shell3 Another object is to provide a motor driven is a flange H to which issecured a par i ion. or

rotary compressor wherein the clearan e b tween transverse wall, 53 bybolts 55 (shown in Fig. 2). t w;- and t n of e compressor cylinder Theflange 5| and the partition 53 thus serve to mybereguhged. eofdividetiieinterior of-the shell into an intake, or A still furtherobject is toprovide amorev tion. chamber 51 a d an'outlct, r discharge, compact andple refrigeration. compresson 1 chamber 59. The rotor 83 extends througha These and further objects will be apparent" bore H in r ition i1 in his located from the following specification of whichthe needle bearingand 011 which th W ar mm apart andin which rests. Within the dischargechamber 59 the rotor Figure I is a view in section of a compressor 1providcd w h 8 P o 51 8 1 diamconstructed in accordance with theprinciples or eter than the portion of the rotor in the suctionthe-present invention.

1 1 2 is as. sectional view t alongljne slots 55.: as shown' in Fig. 3,which receive the '2--%ot Fig.1.-'- t dcvanesflrn j mum 3 is asectionalview taken along line- Surroundingthe'rotor section 63 and thevanes H of Y 31 is a'cylinder 63 which is eccentrically bored chamber5?. The portion is providedwith Referring to Fig. the casing! of thedriving with respect to the rotor and is secured to the motor hassecured thereto the compressor shell 3 partition 63 by the. cap screws Hand I3; The

by means of the bolts 5 and nuts 1. Between cap screws Ii serve toholdthecylinde'r 69 in position and the cap screws I3 hold the coverplate 8|v and thebearing cover 83 in position. An annular recess I5 isprovided in the outer wall of the cylinder 69 to receive a lubricantfilter material I1, such as steel or copper wool, and, in order tomaintain the filter material in the recess, the cover 19 is providedaround the cylinder 69. I

t will be noted from the drawing that the en of the rotor 113, withinthe discharge chamber 59, is reduced in diameter and journalled on abearing 85 abutting against the cover plate 8i and held in position bythe bearing plate 83. The inner race of the bearing 85 abuts against aspacer 871' which, in turn, rests against the shoulder 89, formedadjacent the rotor section 63. The width of the spacer 81 is severalthousandths of an inch greater than the width of the plate 8! in orderthat the position of the rotor 63 and the vanes 57, with respect to theplate BI, may be controlled in the manner about to be described.

The inner race of the bearing 85 is held in position with respect to therotor portion 63 by the washer 9! which is, in turn, located by theposition of the screw 93 threadedly engaging the end or the rotor. Theouter race of the bearing is maintained in position relative to therotor portion 63 by the spring 95 lying between the hearing 85 and thebearing plate 633. The end clearance between the rotor section 63 andthe end plate iii is thus established by the initial difierence andthickness between end plate 39 and the spacer ring 871.

Fluid is admitted to the suction chamber 571' through the check valve9'5 located in the wall oi the compressor shell The check valve til isof ordinary construction and comprises a spindle 3S3 reciprocatinglymounted in a sleeve its, supported by the extensions i633, formed on thebore 635, of the valve body liii which is secured on the i compressorshell. Secured to one end of the spindle by the nut iilifi is a valveproper iii, resting between two metal washers M3 and M5. The valvenormally rests on its seat M, bein held there by the spring H9,surrounding the spindle the sleeve not and bearing against extemions M33and the washer 923.

In addition to the check valve ill, a manually operated valve 123 issecured to the valve body Hill! by means of the-ring H25 and the bolts32?]. The valve 123 is of conventionai design and need not be describedhere except to point out that fluid to be compressed is supplied throughthe conduit 1129 and, so long as the valve disk. I35 rests on its seati353, shown in the Fig. 2, all fluid entering through the conduit E29must escape from the valve through the check valve or to the suctionchamber iii. If, however, it be desired to by-pass the suction chamberand render the compressor inoperative, it is only necessary to The valveMI is connected to the discharge conduit I44 and also to a by-passconduit I42.

Any fluid entering the suction chamber 51 through the check valve 91 isadmitted to the compressor cylinder through the intake ports I45,indicated by dotted lines in Fig. 2, provided in the partition 53. Inorder that any forei matter in the incoming fluid shall be preventedfrom entering the cylinder, a screen I41 held in place by the rings I49on the partition 53 is provided.

As will be seen from Fig. 3, any fluid entering through intake ports Iis compressed as the rotor moves the vanes around the cylinder wall in acounterclockwise direction to the outlet ports I5I. A guard I53 isplaced over the outlet ports in order to prevent any filtering material11 from entering and clogging the ports I5I. Any fluid discharged mustpass completely through the filtering material and escape through theoutlet I55 provided in the cover 19'. Within the cover 19 a grate 151 isplaced so as to prevent any of the filtering material from escapingthrough the outlet I55. The compressed fluid entering the dischargechamber 59 .escapes therefrom through the discharge port I43, valve HIand the dischargepipe I44. I

The lower portion of the discharge chamber 59 serves as an oil orlubricant reservoir which is normally subjected, when the compressor isoperating, to the discharge pressure of the compressor. A passage 59,formed in the flange 5i and partition 53:, serves to remove lubricantfrom the reservoir. To prevent foreign matter in the lubricant fromentering this passage, the screen filter, generally indicated at 56!, isprovided. A coupling i153, acts to connect the passage with a finnedcooling tube 1165 which is located in the suction chamber 5!. Thecooling terminates in a coupling it'll, secured in the tition 53, andcommunicates with the recess to formed in the partition 53 to surroundthe sealremove the cap H35 and turn the spindle it? so that the valvedisk Ml moves away from its seat and fluid may then escape through theconduit i539. Normally, however, the valve disk IN is maintained on itsseat and all fluid entering through conduit E29 passes into the suctionchamber when the dlflerence in pressure between the pressure in suctionchamber 51 and the pressure in the conduit M9 is suiflcient to permitthe check valve iii to open. v

A valve Ill, similar in all respects to the valve 823, is placed at thedischarge port 343 of the outlet chamber 38 and, since the valves areidentical, valve iii. need not be further descri ed.

ing means previously described.

The lower portion of the recess I63 opens into the bore ilil extendingthrough the partition and communicating with the conduit M3 pro-' videdin the cylinder $9. In order that oil or lubricant which is forcedthrough the conduit M3 may be employed to lubricate the bearing 85.,appropriate passages E15 and ill are provided the cover plate 8i and thebearing plate 8213 re spectively.

With this arrangement it is apparent that,

when the compressor is operating, the fluid discharged from thecompressor, being under pressure, will force lubricant through thescreen Ifii, the passage iEE, through the coupling I53, to the coolingtube I65, wherein the temperature of the lubricant is lowered, andthence to the recess S89. Lubricant in the recess will not onlylubricate the seal but also the needle bearing 49 and some lubricantwill enter between the rotor section 83, the vanes 81 and the partition53 to lubricate the compressor. At the same time, oil will flow throughthe bore III, conduit I13 and the passages I15 and I" to lubricate thebearing and also provide lubricant between the cover plate 5i and therotor section 83 and vanes 8! Since some or the lubricant enters thecompressor, it is to be expected that the fluid escapmg through theoutlet ports IiI will carry some of this lubricantand it is to removesuch lubricant that the filtering material I! is provided. The lubricantremoved from the fluid by the filter will drain back into the outletchamber through the grate I51 and the outlet #55 so that a constantcirculation of lubricant is provided.

Although the invention has been described with reference to one specificembodiment the invention is not to be limited save as defined in theappended claim.

We claim:

In a refrigerant compressor, the combination of a shell, a transversewall in the shell, an intake chamber defined by the shell and wall, adischarge and oil chamber defined by the shell and wall, a rotor in thedischarge chamber, vanes carried by the rotor, a cylinder cooperatingwith the vanes eccentric with respect to the rotor on the transversewall, ports in the transverse wall through which refrigerating fluid mayflow from the suction'chamber into the cylinder for compression by thevanes and rotor, discharge ports in the cylinder to remove thecompressed refrigerating fluid, an oil filter surrounding the cylinder,a plate surrounding the cylinder and retaining the filter thereon, ascreened port in the plate to enable refrigerating fluid to escape fromthe filter, a screen in the discharge and oil chamber, a conduit in thesuction chamber associated with the last named screen, a cooling coilcommunicating with the last conduit in said suction chamber, bearingsfor the rotor on the shaft, and conduits to convey oil from the coolingcoil to the bearings and said rotor, said discharge pressure maintainingthe oil under pressure and forcing it to the bearings and rotor.

JOHN LE VALLEY. AUGUST M. STENGER.

